It turns out there's a lot of misinformation out there — still — about contouring. Case in point: Celebrity makeup artist Sir John sees the same three contouring mega-fails, like, every day. Heed these warnings, though, and you'll reach contour perfection just like J.Lo.

1. Thou shalt not use a shimmery bronzer. Something to keep in mind: All brown-hued makeup is not created equal. Bronzer and terra-cotta shades have warm undertones, while contouring powders have a cool base. Sure, to an untrained eye (read: not a makeup pro) they look the same in the packaging, but they won't show up the same on your skin. Trust. The two deliver 180-degree different effects: "Bronzers are meant to warm up the face and bring a sense of brilliance to it," Sir John says, "while a contour is meant to create depth."

For example, you swipe matte contour powder below your cheekbone to instantly carve it out. This creates a shadow and the illusion that your cheek looks hollower. But if you swipe on an orangey, flash-catching bronzer there instead, as Sir John puts it, "You'll look a little like the Oompa Loompas from Willy Wonka and the Chocolate Factory." So, instead of trying to make your bronzer a multitasker, pick up a powder specific to the task, like L'Oréal Paris Infallible Pro Contour Palette, which comes in (appropriately cool-toned) light, medium, and dark shades.

2. Thou shalt not skip highlighter — ever. "A contour and a highlight go together like peanut butter and jelly," explains Sir John. Contours mimic shadows by absorbing light. To counterbalance that, you want a hit of highlighter to reflect light where you need it and put a spotlight on features like your killer cheekbones. Don't want to add an extra step into your routine? Cut back on the work with L'Oréal Paris' all-in-one Infallible Pro Contour Palette. The V-shape brush picks up — and deposits — highlighting and contouring powder in one swipe. To apply it properly, hold the brush at your ear and swipe downward. That way, the light powder hits your cheekbone and the dark powder goes underneath it. It's basically goof-proof.

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Jeff Allen

3. Thou shalt not see contour lines. It turns out that visible contouring lines (VCL) are as unacceptable as visible panty lines (VPL). "Anytime you see a line, you've failed," Sir John says. "Even when you're doing your contour, you should only see a line for a second or two at most." Wait, say what? No stripes? If you've been watching YouTube tutorials on repeat, this one's a shocker. But his logic makes perfect sense: Shadows — the very thing you're trying to create with your contouring powder — are diffused; they don't leave sharp lines on your face. And mimicking them is all about using the right brush. The V-shape one that comes in the L'Oréal Paris Infallible Pro Contour Palette creates soft shadowing for cheekbones. For shading on the border of the face, neck, and décolletage though, Sir John uses Marc Jacobs Beauty Angled Brush. Pro tip: To make the brush head extra big, he bleaches the bristles: The fluffier the brush, the more diffused its shadowing will be.